A San Francisco PD sergeant tells TMZ … cops responded to a shots-fired call just after 4:30 PM. We’re told when they got to the scene, 2 Chainz wasn’t cooperative … saying he wanted to handle it himself.

Police later looked at surveillance which show 2 Chainz was the target of the robber after his entourage of 14 people ran away from the scene like “c**kroaches running from a flashlight.”

Additional reports claims that his wallet, trademark 2 gold chains and his car was taken.